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  Front substrate of plasma display panelUSPTO Application #: 20080024396Title: Front substrate of plasma display panel Abstract: Provided is a front substrate of a plasma display panel. The front substrate includes a front glass substrate; a number of pairs of first electrodes which are formed in parallel with each other on the front glass substrate, and are made of a transparent conductive material; a number of pairs of second electrodes which are formed in parallel with each other on the front glass substrate, and are made of a material whose specific resistance is relatively smaller than that of the material of the first electrode; and a number of auxiliary electrodes which electrically connects the first electrodes with the second electrodes, to thereby make an area of the first electrode contribute to brightness and to thus raise a contrast ratio and improve a luminous efficiency greatly. (end of abstract)
Agent: Rosenberg, Klein & Lee - Ellicott City, MD, US Inventor: Cheol Hee Moon USPTO Applicaton #: 20080024396 - Class: 345 60 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20080024396. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS [0001]This application claims the benefit of Korean Patent Application No. 10-2006-0070110 filed on Jul. 26, 2006, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. BACKGROUND OF THE INVENTION [0002]1. Field of the Invention [0003]The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which an auxiliary electrode which electrically connects a bus electrode and a transparent electrode is installed to heighten a contrast ratio and improve a luminous efficiency. [0004]2. Description of the Related Art [0005]In general, a plasma display panel (PDP) displays images thereon using a gas discharge phenomenon, and shows various excellent display abilities in view of a display capacity, brightness, contrast ratio, afterimage, and an angle of vision, and enables implementation of thin and large-area devices. Accordingly, the plasma display panel (PDP) replaces an existing cathode-ray tube (CRT), in a TV or monitor market from several years ago, and is placed on a representative digital device together with a Thin Film Transistor Liquid Crystal Display (TFT LCD). [0006]In the plasma display panel (PDP), plasma discharge occurs by discharge gas which is filled in a cell between electrodes by a direct-current (DC) voltage or alternating-current (AC) voltage, and fluorescent materials are excited by emission of ultra violet rays accompanying the plasma discharge, to thus emit light. [0007]FIG. 1 is a perspective view showing a part of a conventional plasma display panel. The plasma display panel of FIG. 1 has a structure that respective color light emitting cells are arranged in a matrix form, and illustrates an alternating-current (AC) surface discharge type plasma display panel. In FIG. 1, a front glass substrate 8 and a rear glass substrate 9 are arranged in parallel with each other and a barrier ribs 3 is interposed between the front glass substrate 8 and the rear glass substrate 9. A scanning electrode 5 and a sustain electrode 6 which form a discharge electrode pair are arranged on the front glass substrate 8 in parallel with each other. A dielectric layer 7a and a protective layer 2a are formed to cover the scanning electrode 5 and the sustain electrode 6. [0008]On the other hand, an address electrode 4 is arranged on the rear glass substrate 9, orthogonal with the scanning electrode 5. Respective color fluorescent material layers 7 are arranged in spaces partitioned by the barrier ribs 3 between the dielectric substance layer 7b and both plates, respectively. A discharge gas (fox example, neon or xenon) is filled and sealed in the spaces. Accordingly, the plasma display panel has a structure that the respective color light emitting cells are formed. [0009]FIG. 2 is a plan view showing an electrode structure which is formed on the front substrate of the conventional plasma display panel illustrated in FIG. 1. [0010]Referring to FIG. 2, the plasma display panel uses a principle that plasma discharge occurs if a voltage is applied between two electrodes. The plasma display panel includes a pair of a transparent electrode 2 and a bus electrode 1 which forms the scanning electrode 5 and the sustain electrode 6, respectively, and the barrier ribs 3 which is orthogonal with the scanning electrode 5 and the sustain electrode 6, and is formed on the rear substrate 9 to thereby provide a structure of securing certain spaces to cause discharge. [0011]Here, discharge occurs between a pair of the transparent electrodes 2 which are main electrodes that cause discharge. The bus electrodes 1 play a role of supplying electric current supplied through ends of the bus electrodes 1 for the whole electrode lines quickly. [0012]Here, the transparent electrode 2 is transparent but has electrical conductivity. Accordingly, the transparent electrode 2 is an essential material for a display device. However, since the transparent electrode 2 has specific resistance of about 10.sup.-3 .OMEGA.cm, it has insufficient electrical conductivity to be used as an electrode for a large-size plasma display panel. If the transparent electrode 2 is used for the large-size plasma display panel, voltage drops are caused all over lines and nonhomogeneous electrical characteristics appear all over the whole area of the panel. [0013]Therefore, the bus electrode 1 having Ag whose specific resistance is very low as about 10.sup.-6 .OMEGA.cm as a main ingredient is formed on the transparent electrode 2 to thereby solve the above-described problem. [0014]Meanwhile, a method of forming the transparent electrode 2 employs coating an indium tin oxide (ITO) film on a glass substrate by sputtering and patterning the resultant product by photolithography (including exposure, developing, and etching). [0015]In addition, various methods are known to form the bus electrode 1. According to the most representative method, paste that contains photosensitive material having Ag as a main ingredient is printed on a substrate, and the resultant product is patterned using photolithography. [0016]Meanwhile, since the transparent electrode 2 and the bus electrode 1 are electrically connected with each other, it is important to align the bus electrode 1 on the transparent electrode 2 in place. As illustrated, the bus electrode 1 is generally located at a distance "A" from the outer block of the transparent electrode 2. The reason is to put a margin so that the bus electrode 1 is well aligned with the transparent electrode 2 all over the panel. [0017]In this case, assuming that a line width of the bus electrode 1 is "B," an area equivalent to "B" does not contribute in brightness at the time of plasma discharge and consumes electric power. Areas equivalent to "A" and "C" contribute in brightness. [0018]Here, "A" is 10.about.20 .mu.m, "B" is 50.about.100 .mu.m, and "C" is 100.about.300 .mu.m. The area that "B" occupies reaches about 30.about.40% of the whole transparent electrode area. As a result, a very big area of the transparent electrode does not contribute in brightness, and electric power is wasted accordingly. [0019]FIGS. 3A through 4B are plan views and cross-sectional views showing a front substrate structure in which a black stripe is added in the conventional plasma display panel, respectively. [0020]First, FIGS. 3A and 3B are a plan view and a cross-sectional view showing an electrode structure of a conventional PDP front substrate in the case that bus electrodes and black stripes are formed at the same time using the same material. [0021]Referring to FIGS. 3A and 3B, electrodes of the PDP front substrate include transparent electrodes 2a, 2b, and 2a' to a front glass substrate 8, and bus electrodes 1a, 1b, and 1a' which are electrically connected in contact with the upper portions of the transparent electrodes 2a, 2b, and 2a'. Thus, since voltage supplied for the bus electrodes 1a, 1b, and 1a' is supplied for the transparent electrodes 2a, 2b, and 2a' as it is, plasma discharge occurs in a gap between the transparent electrode 2a and the adjoining transparent electrode 2b by a voltage difference between the bus electrodes 1a and 1b. [0022]As illustrated, in the case of an actual PDP panel, a plurality of pairs of transparent electrodes 2a and 2b which form a pair with each other exist. In this case, discharge should occur only between the transparent electrodes 2a and 2b that accomplish one pair with each other, and the transparent electrodes 2a and 2b should be electrically insulated with the other adjoining transparent electrode 2a'. Continue reading... Full patent description for Front substrate of plasma display panel Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Front substrate of plasma display panel patent application. Patent Applications in related categories: 20080231551 - Discharge display device - On a front substrate, a dielectric layer for accumulating the wall charge is formed, and inside the dielectric layer, a first electrode and a second electrode intersecting each other are formed with a predetermined pitch. The dielectric layer is not flat but is convex at the intersection of the first ... 20080231552 - Plasma display apparatus - In the plasma display apparatus, after a rising signal and a falling signal are applied to the scan electrodes, the first signal is applied before or after the scan signal is applied during the address period, thereby preventing a loss of wall charges and performing stable address discharges and sustain ... 20080231553 - Plasma display device - A plasma display device includes: a plasma display panel including an address electrode disposed on a first substrate, a pair of first and second display electrodes disposed on a second substrate and crossing the address electrode, a dielectric layer covering the first and second display electrodes on the second substrate, ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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